Those must be Japanese brand trucks or tractors, and they are sold from second-hand cars in China and Hongkong. Because Japan stipulates that there should be three green round lights in front of the roof of heavy trucks, then the three light areas will light up according to the speed at that time, and they will light up during the day and night to remind the car in front (you can see from the rearview mirror) how fast this heavy truck is, and also let pedestrians know how fast this truck is, 0-30km, 30-40 km. Lighting the lamp will let people know its actual speed without feeling it. Reduce accidents. However, what the Three Lights District wrote in China Mainland and Hong Kong is illegal, because only headlights, taillights and command lights are allowed in China Mainland and Hong Kong. The green light on the roof of a truck is not allowed. Many drivers in China and Hongkong will take down the wires or light bulbs and wait until they can't touch them. New licensed trucks shipped from China and Hongkong through agents will not have these three light areas on the roof. The van in this three-light area must be a second-hand car in Japan. In addition: is there any container that is not open or closed?

Reference: experience

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In fact, a few lights are meaningless, so don't wash them.